package com.wenhua.junshao.filter;

import com.alibaba.fastjson.JSON;
import com.wenhua.junshao.common.BaseContext;
import com.wenhua.junshao.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
//创建路径匹配器,支持通配符

    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
//接收的是http请求,需要强制转换

        HttpServletRequest request = (HttpServletRequest) servletRequest;

        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取本次请求的uri路径

        String requestURI = request.getRequestURI();//bank/index.html
//放行不需要增强的的请求
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/login",
                "/user/sendMsg"
        };

        //判断此次请求资源是否放行
        boolean check = check(urls, requestURI);

        //3、如果不需要处理，则直接放行
        if (check) {
            filterChain.doFilter(request, response);
            return;
        }
        //4.1判断登录状态，如果已登录，则直接放行
        Long empId = (Long) request.getSession().getAttribute("employee");
        if (empId != null) {
            BaseContext.setCurrentId(empId);
            filterChain.
                    doFilter(request, response);
            return;
        }
        //4.2判断登录状态，如果已登录，则直接放行
        Long userId = (Long) request.getSession().getAttribute("user");
        if (userId != null) {
            BaseContext.setCurrentId(userId);
            filterChain.
                    doFilter(request, response);
            return;
        }
        log.info("用户未登录");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }

        return false;
    }


}
